Octode Converter
The 7A8 Vacuum tube is a glass lock-in type used as a
converter in superhetrodyne circuits. It requires a
lock-in socket.
7A8 Vacuum tubes are used in Philco 41-220 and 1940-41 radios.
Electrical Data:
Heater Voltage ................................ 6.3 V
Heater Current ................................ 0.15 A
Substitutes ......................... 7B8, 6A8, 6D8G